JPS585143Y2 - bicycle brakes - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bicycle brake shoe, which maintains a high braking effect in rainy weather and has improved strength to withstand long-term use.

This type of brake shoe has a brake shoe body with a plurality of protrusions that come into contact with the rim. Conventionally, in order to improve the braking effect in rainy weather, the rim contact surface of each protrusion has been In order to prevent water from entering, each of the protrusions was formed to have a short length in the rim rotational direction, so each protrusion would tilt significantly in the rim rotational direction due to stress received from the rim in the rim rotational direction during braking. As a result, each convex portion was easily deformed and damaged, and could not withstand long-term use.

The present invention solves the above problems and is characterized by a bicycle brake shoe equipped with a rim abutting convex portion having a flat rim abutting surface on the rim abutting side of the brake shoe body. , the rim abutting convex portion has a substantially semicircular head formed to protrude in an arc shape toward the opposite end at the end opposite to the rim rotation direction, and a substantially semicircular head formed to protrude in an arc shape toward the opposite side; The main body part is elongated so as to gradually become narrower in the direction.

Hereinafter, the present invention will be described according to an illustrated embodiment. In FIGS. 1 to 3, reference numeral 1 denotes a rim, which rotates in the direction of arrow A when the bicycle is running.

2 is a pair of left and right brake arms, 3 is a boat-shaped 7-Y holder attached to the tip of each brake arm 2, and 4 is a pair of left and right brake shoes, which are made of elastic square rod-shaped hard rubber. Attachment portions 5 formed at the base thereof are respectively held by the shoe holders 3, and the shoe body 4 can freely approach and separate from the left and right contact surfaces 6 of the rim 1 by rotation of the brake arm 2.

On the rim abutting side of the shoe body 4, a rim abutting convex portion 7 having a flat rim abutting surface 7a is formed integrally with the main body 1 so as to protrude at the same height over its entire area. ing.

The rim abutting convex portion 7 has a substantially semicircular head 8 formed at the end opposite to the rim rotation direction so as to protrude in an arc shape toward the opposite side, and a substantially semicircular head 8 formed from the head 8 The body part 9 is elongated and extends so that the width gradually becomes narrower toward the rim rotation direction side.

According to the configuration of the above embodiment, when the brake is operated, the brake arm 2 rotates in the direction of arrow B, and the rim abutting convex portion 7 presses the abutting surface 6 of the rim 1 to perform braking.

At this time, if water adheres to the abutting surface 6, the water will be removed from the edge 8a of the head 8 of the rim abutting convex portion 7, as shown in FIG.
The body 9 is smoothly moved in the direction of arrow C along the side edges 9a, 9a of the body 9 relative to the rim abutting convex portion 7, and the body 9 is gradually moved from the head 8 toward the rim rotation direction. Since the width is narrow, water intrusion into the rim abutting surface 7a is extremely effectively prevented, so that substantially the same braking effect can be achieved even when driving in the rain as when driving on a sunny day.

In the above embodiment, one rim abutting convex portion 7 is provided on the shoe main body 4, but a plurality of rim abutting convex portions 7 may be provided as shown in FIGS. 4 and 5.

According to the present invention, the rim abutting convex portion 7 includes a head portion 8 and a body portion 9, and the head portion 8 is approximately formed to protrude in an arc shape toward the side opposite to the rim rotation direction. Since it is semicircular, when water adheres to the rim 1, the head 8 moves the water adhering to the rim 1 to the outside in the width direction of the rim abutting convex portion 70 along the arc-shaped edge 8a of the head 80. Moreover, since the body part 9 is elongated and gradually narrows in width from the head 8 toward the rim rotation direction, the body part 9 can be removed smoothly from the rim 1.
On the other hand, the head 8 can reliably slide on the portion from which water has been removed as described above, and therefore the rim abutting surface? The intrusion of water into A is extremely effectively prevented, and even when driving in the rain, substantially the same braking effect as in sunny weather can be achieved.

Further, due to the above-described shape of the body portion 9, the rim abutting convex portion 7 has an elongated shape as a whole in the rim rotating direction, and therefore, during braking, the rim abutting convex portion 1 is large in the rim rotating direction from the rim 1. Even when subjected to stress, the corresponding abutting convex portion 7 does not tilt significantly in the rim rotation direction, and damage or deformation of the rim abutting convex portion 7 due to stress from the rim 1 can be prevented.

Furthermore, the head 8 is located at the end opposite to the rotational direction of the rim, and is most susceptible to the resistance of sand and mud adhering to the rim 1, making it more likely to wear out. sand and mud adhering to the body can be removed smoothly in the same way as with water, and the edge 8a of the head 8 is not angular but arcuate, and the width of the head 8 is (compared to the body 9). ) Because it is a dog,
Wear of the head 8 can be suppressed as much as possible, and since the width of the body 9 gradually becomes narrower from the head 8 toward the rim rotation direction as described above, the head 8 is free from sand with respect to the rim 1. Although the body part 9 is narrower than the head part 8, there is almost no wear due to sand or mud, and therefore the rim abutting convex part 7 is This is the shape that causes the least wear in terms of overall ratio, and together with the ability to prevent deformation and damage due to stress from the rim 1, it has enough strength to withstand long-term use.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a perspective view of the main parts, and Figs. 4 and 5 are main points showing respective embodiments. FIG. 1... Rim, 4... Brake shoe body, I... Rim abutting convex portion, 7a... Rim abutting surface, 8... ...Head, 9...Torso.

Claims (1)

[Scope of utility model registration request] In a bicycle brake shoe that includes a rim abutting convex portion 7 having a flat rim abutting surface 7a on the rim abutting side of the brake shoe body 4, the rim abutting convex portion 7 is opposite to the rim rotation direction. At the side end, there is a substantially semicircular head 8 formed to protrude in an arc shape toward the opposite side, and from the head 8 to the side in the rim rotation direction, the head 8 gradually becomes lj-shaped. A bicycle brake shoe characterized by comprising a body part 9 extending in an elongated manner.